Form for concrete work



Feb. 24, 1925.

V 1,527,432 2.- a HALL FORi FOR CONCRETE WORK Filed April 22, 1922 a snem me 1 Feb. 24, 1925. l;527,432

' E. E. HALL FORM FOR CONCRETE WORK Filed April 22, 1922 3 Sheets-Sheet 2 I/wE/Wa/ Feb. 24, 1925.

1,527,432 E. E. HALL Foam FOR CONCRETE wonx Filed ApriI22, 1922 3 sheets she'pt n lay/6g, A05 57?? I I 1 527 4 2 UNITED STATES: PATENT OFFICE :snro E; HALL, or cHIcAGo, ILLINOIS.

L FORM FOR CONCRETE WORK.

Application filed April 22, 1922-. Serial N0.'5'56',0 l8.

To all whom itmay concern:

Be it known that 1, Euro Hans a citizen of the-United States, anda resident of Chicago, in the county'ot' Cook and State of Illinois, have invented certain new and useful llnproven'ients in Forms for Concrete lVork, of which the following is a "tulh clear, and exact specification.

My iuventionds concerned with forms and scaltoldings for making concrete floors, ceilings, etc, and isdesignedprimarily to produce-simple mold sections or torinstl iat canhe used repeatedly without the lialnhty of material damage thereto; either in use or in transportation from one' jo'b toaiiother,

and in which the wooden faces "which coine in contact with the concrete can be readily renewed it it becomes necessary.

It is further concerned with the production of forms or mold sections thlit can he quickly and easily setup When they are to he used,-and which can he as easily and quickly taken down when the concrete is sufficiently set.

It is further concerned withithe production of forms or inold sections that can be readily adjusted to vary the width thereof so to produce aseiies or parallelfloor joists that are spaced nearer to or farther from each other.

It is further concerned with the produc-' tion ot forms or mold sections that can be adjusted to make one end of one section narrower than the other end of the-same section as is desired where floor joists are to he molded that are wider at their ends to strengthen then'i atthe-p'on-it of their connection with the niain beiuns or gii'ders.

It is further concerned with the produc tion of :torinsor inol-d sections that can be" con'ihined and ad ustedto form floor oists of dill'erent lengths, widths or depths.

It is further concerned with the pr0duc tion otsuch forms or mold sectionsas' shtlll be capable of adjustment iii-any two on more or in all the ways incorporated in the three preceding paragraphs;

A further feature of my inye-nt-ion resides in a novel; scafi'olding and form structure by on the line 7 7 of Fig. 6'

taken down without the necessity of employing any screws or nuts.

l-inother feature resides in the employment of such a scaffolding structure with the parts thereof adjustable toivavry the depth and distance apart of the resulting floor joists, Wl'iiClTfidjUStlilBHtS do not have to he interfered with when the scaffolding is taken down, so that it can here-erected on an other floor or another job by merely putting the parts together without the necessity for readjusting any of the parts to insure that the joists ofthe new floor shall have the same dimensions as those of the preceding floor;

Another feature of my inveiitionresides in a novel scaffolding structure to be used in connection with forms in which I aln enabled to use much lighter supporting beams than hasbeen possible heretofore, and still look the beams securely in place while theyare in use and readily remove them when the work is finished.

To illustrate my invention I annex hereto identical parts in all the figures, of which,'

Fig; '1 is a perspective View, showing a portion of the scaffolding with a portion of the forms thereon before the concrete is poured, and another portion with the con cre-te in place;

Fig; 2 is a top plan View of one ot the forms on a larger scale, with portions of the top thereoit broken. away;

Fig. 3 is a vertical section on the line 3-3 of Fig. 2;

4. is atop plan View showing one form and a portion of another somewhat modified from the construction shown in Figs; 2 and 3;

Fig; 5 is a perspective View of one end of a form section with the overlapping end sections applied thereto;

6 is a View in, section on the line 66 of Fig; 3,-but on a still larger scale;

Fig. 7 is an inverted plan View in section Fig. '8 is an inverted plan View in section onthe line 88 of Fig. 6; and

Figs; 9 110, 11, 12 and 13 are sections on the lines 9-9, 10-10, 11-41, lei-12am 13-13 of Fig. 6.

Referring first to Fig. 1, 20 represents one wall of a building and 2]. represents a concrete floor that has already been erected therein and hardened, while 2] represents a portion of similar floor above the floor 21, which similar floor has been poured but not yet hardened. The portion 22 represents a girder in connection with the concrete floor parallel to the wall 20.

After the floor 21. has set sutliciently to stand the st ain of erecting the floor above, I form a scaffolding which is made up of uprights 23 placed upon planks 24llaid on the floor 21. On the uprights 23 adjacent the wall 20, I place the transverse beam er, and where the space letween the wall 20 and the girder 22 or the adjacent wall is long, so as to eer an intermediate sup port, I employ one or more of the uprights 23, which uprights will have the blocks 25 secured thereon to support the transverse beams 24 in the same plane as the beam 24;. On the uprights 23. located beneath the trough 26. in which the girder 22 is formed, I place the cross heads 27, which may be braved by the pieces 28. and on the cross heads I place the transverse beam 24, as well as the tiller 29 on which the trough 26 rests.

The longitudinal beams or joists of the scaffolding are preferably formed in two parts. the lower part 30 consisting of wooden planks 2 x 10, placed on edge, and resting on the beams 24, 24 and 24 The necessary width for forming the bottoms of the molds for the concrete floor joists is secured by placing centrally over the planks 30 the narrow planks 31, which are preferably made of inch stuff of the proper width, say four or five inches, to form the desired thickness of the joist, and it will be understood that narrower joists may be produced by using narrower planks, as seen at 31 Where the ends of the concrete floor joists are to be thickened, as, for instance, those connected with the wall 20. the width of the ends of the planks 31 is increased by nailing or otherwise securing to the ends thereof the triangular pieces 32.

Passing now to the construction of the forms. which is shown more especially in the other figures, these forms are composed of the wooden sides preferably made of inch stud. and preferably secured to the angle irons by the bolts 35 having countersunk heads. When the forms are in place, the edges of the planks 31 engage the sides 33, as shown in Fig. 6. The tops of the forms are made of the boards 36, of the same character as the side boards which boards are secured by the countersunk bolts 37 to the angle irons 38. It will be understood that T preferably employ a pair of the angle irons 34; fastened to the boards near their ends, and that I like wise employ a pair of the angle irons fastened to the top boards 36 at the same relative position, as the angle irons 3st and co-operate in a manner to be subse quently described, The central. space of the top of the mold may be formed either of the thin metal 39, or of the boards 39", shown in Fig. 4, and it will be understood tl at where the job requires frequent l'ianges in the distance between the joists, I preferably employ the thin-metal lop central. portion 39, as, inasmuch as it overlaps at its edges the boards 36, it can. be adjusted to different distances between the joists without any di'lhculty. Where the adjustments of the distance between the joists are infrequeut,-that is to say, where a large number of joists of the same distance apart are to be produced l preferably employ the boards 39*, sh wn in Fig. 4, which will be sawed to the exact width necessary to fit in between the boards 36, and it will be understood that instead of making the boards 39" of the same length as the mold sections, sat four feet, the boards 39 are made in one piece as long as is necessary to extend from the wall 20 to the girder 22, if such a length is possible. If not, two boards are employed which have the proper length when placed end to end so that they will extend from the wall 20 to the girder 22.

It is desirable that the sides can be drawn toward each other slightly in remov ing them after the concrete is set, and, for this purpose, I employ the connections between the angle irons 34 and 38 now to be described: On the upper ends of the angle irons 34, l secure, as by the rivets 40, the metallic piece 41, which is preferably constructed of metal bent to substantially a U- shape in cross section but with the connecting portion thereof removed above the top of the angle irons 34;, as clearly shown in Fig. 6. The angle irons 38 have formed therein, near the outer end, the inclined slot through which passes the rivet 1-3 secured at its ends to the part 4-1. A parallel slot 44 in the angle irons 38 accommodates the pin or heavy nail 45 passed through aligned recesses in the part 41. If the sides are drawn toward each other, it will be seen that the action of the pins 43 and 45 on the inclined slots 4-2 and 44 will be to simultaneously draw the sides from the top pieces 36.

To hold these side pieces properly spaced apart, while at the same time permitting them to he quickly detached. I employ the adjustable thrus bar best shown in Figs. 6 and 8. where it will be seen that l employ a pair of foot pieces 4-6, made of a pair of metal strips riveted together at their inner edges and one of them having the concave central portions 47 forming a substantially circular pa do for the ad acent portion of the bolt 48, which has its outer en d 49 turned at right angles so as to fit into the aperture 50 formed in the angle iron 34. A nut 51 screwed up against the foot46, whichembraces the edge of the angle iron 34-, as shownin Fig. 8, serves to secure the bolt 18 rigidly in position projecting at right angles from the associated angle iron 34. The bolt 4.8 is threaded into a nut 52, which nut is rigidly secured in the end of the channel piece 53, which has formed in the bottom thereof the slot 54 with the notches 55 formed in the edge thereof so that the squared portion 56 adjacent the head 57 of the bolt 58 will fit in any desired pair of the opposed notches 55 and hold the bolt in position so that when the wing nut 59 is screwed ClOWllvill'lQ channel 53 will be secured relative to the companion channel 53, both of which channels have their co-operating edges serrated, as seen at 60, so as toenable me to make a quick adjustment of the length of the spacing bar. The channels 53 and 53 have secured ontheir other endsthe U- shaped pieces 6].,voverlapping theadjacent channel pieces 53 or 53 as the-case maybe, to hold the two channel pieces in alignment. With the construction shown, it will be obvious that the sides 33 can be quickly spread by first adjusting the length of the spreader bars roughly byunloosening the nut 59 so that theserrations 60 can be disengaged, and then screwing down the nut 59 to secure the bar-Lin. its rough adjustment, after which the final adjustment is secured by simply rotating the locked channels 53 and53 on the ends of the oppositely threaded bolts 48, thus securing the i ordinary turnbuckle action.

To support the forms at the proper height relative to the boards 31, and thus regulate the depth of the concrete joists, I preferably employ the following mechanism: At suitable intervals on the vertical boards 30, I hang stirrup members 62, which are preferably constructed of metal, and have the plain portion 63 at the top adapted to fit over the top of the plank 30, and the sides,

which are in the form of channels in horizontal cross section. Vfhile these sides might be plain rectangular channels, I preferably construct them as shown, with the edges 64 engaging the sides of the planks 30 and the inclined portions 65 connecting the edges 64 with the central portion 66, which is spaced away from the planks 30 and provided at suitable intervals with the longitudinal apertures 67,there being as many of these apertures 67 on each side of the stirrup as there are desired adjustments for different depths of the concrete joists. Cooperating with these apertures 67 are the hooks 68 formed on the ends of the overlapping bars 69, each of these bars having secured on its end a. loop 70 embracing the co-operating bar. These bars have formed therein regularly spaced apertures 71, and

the complete bar formed by the two bar:

sections can be made of any desired length as is necessary to secure the desired dis tance between the concrete joists by bring ing the necessary apertures 71 inthe two bar sections into register and thrusting the nail 72 through a co-operating pair of the apertures 71. The end of the wire nail 72 is then turned over; and by keeping these bars in the same adjustment, the same distance between any numberof concrete joists can be secured without any change or readjustment of this sup-porting bar. Instead of resting the sides 33' directly on the bars 69, I preferably cinploy the scat piece 73, which is preferably formed of metal, and, as shown in Fig. 10, is U-shaped in cross section with its upper edges turned out. The seat member 73 is held in place on the bar 69 by the key 74, journaled in suitable bearings in the piece 73and having the handle 75 extending on:

the outside, by which it can be manipulated. This key has a portion 76 thereof, of the wldth of the-bar 69, cut away, and the top of the bar '69 preferably has a plurality of curved recesses- 77 formed therein, in which the key 74 rests indifferent adjustments of the same relative to the end of the bar 69. The turned'over tongue 69 keeps the seat piece 73 from falling oil of the bar 69 while being handled.

When the forms are assembled and ready for pouring, as shown in Fig. 6, the handle 7 5 of the key is vertical, and the seat member 73 is held atits highest position. After the concrete has sufficiently set so that the formsican be removed, and before the thrust bar has been shortened up, the handles 75 are turned at right angles to bring the cutaway portion 76 next to the bar 69. This allows the flange portionsof the seat pieces 73 to fall away from the sides 33 enough so that the seat pieces can be slid inward and from beneath the sides 33, and when they are so slid in, the bars 69 can be lifted sufficiently to disengage the books 68 from the'recesses 67. When they are disengaged, they can be removed, and by operating the turnbuckle of the thrust bar, the sides can now be drawn in. to disengage them from the edges of the planks 31, as well as from the sides of the concrete joists, and the form sections can now be removed.

Provision for the bringing of the top pieces 36 nearer to or farther fromfieach other and for rigidly connecting them is made by employing the angle irons 78, which have the pair of elongated slots 79 therein to accommodate the bolts 80 passed through the apertures 81 in the ends of the angle irons 38. To secure an adjustment for exact widths of the form to space the concrete joists apart the desired distance, I provide in the lower cc ges of the angle irons 38 the row of spaced apertures 82, and in the endof the angle iron 78, I locate an aperture 84 for the nail 83., which, when the parts are assembled, will be passed through said aperture 84:, the selected aperture 82 in the angle iron 38, as well as the aperture 85 (see Fig. 11) formed in the portion 86 ot the angle iron 78 which has been turned up to co-operate with the adjacent edge of the angle iron 38 and keep the two angle irons in proper relative position. After the desired adjustment is made by the nails 83, the bolts on the nuts 80 are tightened up and the (esirea adjustment is made permanent for that particular job. Where the overlapping top portion 39 is employed, I preferably form it of two pieces with the downturned flanges 37, which will be bolted or otherwise secured together, and are provided at suitable intervals with apertures through which the hook bolt 88 is passed to support the spring strips 89, which are bow-shaped. and which are turned to transverse position so that their ends engage with the under sides of the boards 33 and hold the overlapping top piece 39 in position. Of course, to release the same, all that is necessary is to turn the strips 39 to a position parallel to the flanges 87.

It will be obvious that all these connections and adjustments can be made from the top of the scaffolding, so that it is unnecessary to get underneath the same to put the forms in place, although of course it will be understood that the forms have to be removed from below when they are taken down.

By reference to Fig. 3 will be seen the preferred arrangement of the supporting bars relative to the thrust bars. While I might employ more of the supporting bars, I preferably employ one at each end of each joist, and I place another one where each pair of the mold sections abut, so as to obviate the necessity of employing two of the supporting bars for each mold section, although, of course, it will be understood that two of the thrust bars are necessary for each section. On the two mold sections at the ends of the joists, I employ the overlapping end pieces 90, which are preferably formed of sheet metal, and are shaped to conform to the cross section of the mold. They have the tongues 91 turned at right angles at the top of the upper outer corners, and provided with a couple of apertures therein through which nails 92 may be driven into the boards 36 to secure the end sections in place. When they are assembled, as seen in Fig. 1, their lower ends engage either the walls 20 or the trough 26, and are held firmly in place.

If the concrete joists were of some length that is a multiple of the length of the mold sections, which sections are preferably four feet in length, it would not be necessary to make any additional provision. However,

it sometimes happens that concrete joists of some intermediate length, such as eighteen or twenty-two feet, have to be provided for, in which case the arrangement seen in Fig. 1 and at the right-hand ends ot Figs. 2 and 3 has to be employed. Here the ends of the form sections are connected at their sides by sheet-metal pieces 92 overlapping the sides 33 of the forms and having the turned over top portions 93, which are provided at their ends with apertures 94 th ough which nails can be driven into the boards 36 to hold them in place. The open space at the top is filled by boards 95 of the proper length to span the space and of the proper width to extend under the turned over portions 93. to which they might be nailed, but I prefer to support them by employing the small Z-shaped strips 96, seen in Figs. 2 and 3, which. have their top por tions lying upon the boards 36 and which have their lower portions extending underneath the boards 95, to which they are preferably nailed, where such gaps have to he bridged, and I employ the uprights 23. The intermediate piece 31 for forming the bottom of the concrete joist at the gap is preferably longer than the gap and is placed directly on top of one of the uprights 23, which extend high enough above the blocks 25 to serve this purpose. While I may sometimes not employ an upright 23 for a beam, in which case the bridging piece 31 will rest only on the ends of the boards 30, the pieces 31 being shorter than the boards 30 to permit the bridging pieces 31 to rest on the boards 30, I preferably employ one upright 23 for each beam, and stagger them. as shown in Fig. 1. Where this arrangement is employed, after the concrete has been poured, set, and the forms removed, it is the practice to leave the beams 30 and 31 in place as an additional. support until the concrete is thoroughly hardened, but with the arrangement shown. I may before it is fully hardened remove all the boards 30, and the overlying strips 31 and still leave the beams sufficiently supported, since the bridging pieces 31 will each be supported by an upright 2.

here the concrete joists are to be formed with the thickened ends, as illustrated at the wall 20 in Fig. 1, where the boards 32 are connected to the boards 31, the end sections are then adjusted as shown in Fig. 2, so that the sides 33 are set slanting, the connections at the end where the section adjoins the adjacent section being slightly taken in, whereas the connections at the end of the beam are shortened up considerably so as to secure the desired narrowing of the mold at this end. The form of end pieces 90 illustrated serves to permit this adjustment, as the ends are simply overlapped more than they would be otherwise.

From the foregoing description, it will be obvious that the scaiiolding described can be quickly erected with a mmimum amount of lumber entering into it, and after it iserected, the forms can be quickly assembled thereon from the top of the scaiioldin and when assembled the concrete is ready to be poured. After it has set, by reverse action, the forms can be removed from below, leaving the scaffolding intact, to be finally removed when the concrete has hardened to a point where there is no danger in removing the supports for the concrete joists.

While I have described my invention as employed in connection with the making 01" floors of concrete, it will be understood that it might be employed in connection with the making of floors of any other plastic material, and it will be further understood that while I have shown and described my invention as embodied in the form which I at present consider best adapted to carry out its purposes, it is capable of some modifications, and that I do not desire to be limited in the interpretation of the following claims except as maybe necessitated by thestate of the prior art.

What I claim as new, and desire to secure by IiettersPatent of the United States, is:

1. In a scaffolding to support concrete floors, the combination with longitudinal beamsfor forming the bottoms of the concrete floorjoists arranged in pairs in alignment, of means for supporting the outer cnds oi the pairs, transverse beams upon which the inner ends of the longitudinal beams rest, pairs of uprights adjacent the inner ends of the longitudinal beams and supporting the transverse beams, and bridge pieces between the adjacent ends of the pairs of longitudinal beams supported directly by the pairs of uprights.

2. In a scaffolding to support concrete forms, the combination with longitudinal beams for forming the bottoms of the concrete floor joists arranged in pairs in alignment and composed of the narrow body portion and the wider top portion supported thereon, of means for supporting the outer ends of the pairs of longitudinal beams, transverse beams upon which the inner ends of the longitudinal beams rest, pairs of uprights adjacent the inner ends of the longitudinal beams and supporting the transverse beams, and bridge pieces correspond ingtothe wider top portions of the longi tudinal beams between the adjacent ends of the pairs thereotsupported directly by the pairs of uprights.

3. In a scaffolding to support concrete forms, the combination with longitudinal beamsfor forming the bottoms of the concrete floorjoists arranged in pairsin alignment and composed of the narrow bbdy portion and the wider top-portionsupported thereon, of means for supporting the outer ends of the pairs of longitudinal beams, transverse beams upon which the inner ends of the longitudinal beams rest, pairs of uprights adjacent the inner ends of the longitudinal beams and having shoulders below their upper ends for supporting the transverse beams, and bridge pieces corresponding to the wider top portions of the adjustablesupporting bars located between adjacent longitudinal beams, inverted U-shaped forms resting on the supporting bars, and means unconnected with the sup ported bars for moving the sides of the forms outwardly to engage the edges of the longitudinally extending beams.

5. In concrete form work, the' combination with longitudinal beams, the upper surfaces of which form the molds for the bottoms of the concrete joists, of niea-nsior supporting said beams, supporting bars, 10- catedibetween adjacent beams, meansior connecting the supporting bar at different heights on the longitudinal beams to vary the depths of the concrete floor joists, forms of an inverted U-shape in cross section resting on the bars and having their sides engaging theedges oi the tops of the longitudinal beams, and means for inovingthe sides of the forms outwardly to engage the edges of the longitudinally extending beams.

6. In concrete form work, the combination with narrow longitudinal beams, of means for supporting the beams, strips placed on thetop of the longitudinal beams to form the bottoms of the concrete floor joists, supporting bars placed at intervals between the adjacent surfaces ofthe narrow longitudinal beams, forms of an inverted U-shape in cross section resting on thesupporting bars, and extensible thrust bars be tween the sides of the forms to force them apart and into iirm engagement with the edges of the strips to form a tight mold.

7. In concrete form work, the combina- 1 tion with narrow longitudinal beams, of means for supporting the beams, strips placed on the tops of the longitudinal beams to form the bottoms of the concrete floor joists, stirrup pieces hanging over the narpieces, forms of an invertedfiU-sliape in 1 cross section resting on the supporting bars, and extensible thrust bars between the sides of the forms to force them apart and into firm engagement with the edges of the str1p to form a tight mold.

8. In concrete form work, the combination with narrow longitudinal beams, of means for supporting the beams, strips placed on the tops of the longitudinal beams to form the bot-toms of the concrete floor joists, stirrup pieces hanging over the narrow longitudinal beams at intervals and having apertures therein at different heights, supporting bars having means at their ends for engaging the apertures m the stlrrup pieces, iorms of an inverted U-shape in cross section resting on the supporting bars, and extensible thrust bars between the sides of the forms to force them apart and into firm engagement with the edges of the strips to form a tight mold, said means being disengagable from the stirrups before the thrust bars are loosened.

9. In concrete form work, the combination with narrow longitudinal beams, of means for supporting the beams, strips placed on the tops of the longitudinal beams to form the bottoms of the concrete floor joists, stirrup pieces hanging over the narrow longitudinal beams at intervals and having apertures therein at different heights, supporting bars having means at their ends for engaging the apertures in the stirrup pieces, forms of an inverted U-shape in cross sec tion resting on the supporting bars, and extensible thrust bars between the sides of the forms to force them apart and into firm engagement with the edges of the strips to form a tight mold, said means being disengageable from the stirrups before the thrust bars are loosened and consisting of the pieces sliding on the thrust bars and having keys passed therethrough with the narrowed portions which can be turned into position to release the pieces from being held in fixed position on the bars.

10. In an apparatus of the class described, the combination with a removable scaffolding comprising uprights and longitudinal beams directly supported thereby, the tops of the longitudinal beams serving as the molds for the bottoms of the concrete floor joists, of transverse supports connecting adjacent beams and extending from the sides thereof and vertically adjustable to vary the depth of the concrete floor oists, and forms, of a generally inverted U-shape in cross section, resting on the supports and having their sides engaging the tops of the longitudinal beams, for the purpose described, said transverse supports being adjustable as to length and the forms adjustable as to width to vary the distance between the floor girders.

11. In an apparatus of the class described,

the combination with a removable scaffold ing comprising longitudinal beams the tops of which serve as the molds for the bottoms of the concrete floor joists, and means for supporting said longitudinal beams, of stirrup pieces located at intervals along the longitudinal beams adapted to rest thereon and having their depending portions U- shaped in horizontal cross section with recesses therein at vertical intervals, transverse supports adapted to enter the recesses in the stirrup pieces, and forms, of a generally inverted U-shape in cross section, resting on the supports and having their sides engaging the tops of the longitudinal beams, for the purpose described.

12. In a form for concrete floors, the combination with a plurality of side and top sections, each consisting of longitudinal boards having a pair of metallic connecting members arranged transversely of and secured on the inner face thereof, adjustable connections between said connecting members so that the width of the form may be varied, and a pair of extensible thrust bars arranged to co-operate with the metallic connecting members of the side sections, said thrust bars being provided With means for roughly regulating their length and forming a turn-buckle for finer adjustments.

13. A form for concrete work consisting of a plurality of angle irons extending across the form on the inside thereof with the vertical webs of the irons projecting inwardly, a plurality of boards having their faces secured to the outside of the bars and extending transversely of the bars to form the mold surfaces, and extensible thrust bars connecting the vertical angle irons for holding them spaced firmly apart.

14. In a form for concrete work, the combination with side portions and top portions having means for varying the effective width of the form, of extensible thrust bars connecting the sides, said thrust bars being provided with means for catching them quickly at suitably spaced distances, and with screw mechanism for intermediate adjustments.

15. In a form for concrete work, the combination with side portions and top portions having means for varying the effective width of the form, of extensible thrust bars connecting the sides, each of said thrust bars consisting of a pair of threaded members connected to the sides and projecting inwardly toward each other, and a second pair of members screwed onto the first, and. adjustable connections between said second pair whereby they can be quickly connected or disconnected in any one of various spaced positions, and .then rotated to turn the second pair on the first pair for finer adjust ment.

16. A form for concrete work consisting of side portions, top portions, and connections between said side portions and top portions whereby one of said sides may be pre liminarily moved inward toward the other side to disengage the form from the said concrete without displacing the top portions relative to the concrete and while maintaining said side portions parallel to the concrete surface with which it had been in contact.

17. A form for concrete work consisting of side portions, top portions, and connections between. said side and top portions whereby both of said sides may be preliminarily moved inward to disengage the form from said concrete without displacing the top portions relative to the concrete and while maintaining said side portions parallel to the concrete surface with which it had been in contact.

18. A form for concrete work consisting of side portions, top portions, and connections between said side and top portions whereby one of said sides may be preliminarily moved inward toward the other side and downward from the top portions to disengage the form from said concrete while n'iaintaining said side portions parallel to the concrete surface with which it had been in contact.

19. A form for concrete work consisting of side portions, top portions, and connections between said slide and top portions whereby both of said sides may be preliminarily moved inward and downward from the top portions to disengage the form from the concrete while maintaining said side portions parallel to the concrete surfaces with which they had been in contact.

In witness whereof, I have hereunto set my hand and aiiixed my seal, this 19th day of April, A. D. 1922.

[In Witness:

JOHN HOWARD MoELRoY. 

